<template>
  <div>
    <h1>爷爷</h1>
    <!-- 爷传孙：传法和父传子一样 -->
    <!-- 孙传爷：接收方法和子传父一样 -->
    <father :grandpa-msg="msg" @sun="handle"></father>
  </div>
</template>

<script>
import father from "./father.vue"
export default {
  components: {
    father
  },
  data() {
    return {
      msg: 500
    }
  },
  methods: {
    handle(val) {
      console.log(val);
    }
  }
}
</script>

<style lang="scss" scoped></style>